Medullary thyroid cancer is a form of thyroid carcinoma which originates from the parafollicular cells (C cells), which produce the hormone calcitonin.Medullary tumors are the third most common of all thyroid cancers and together make up about 3% of all thyroid cancer cases. MTC was first characterized in 1959.
Approximately 25% of medullary thyroid cancer cases are genetic in nature, caused by a mutation in the RET proto-oncogene. When MTC occurs by itself it is termed sporadic medullary thyroid cancer (SMTC). Medullary thyroid cancer is seen in people with multiple endocrine neoplasia type 2A and 2B. When medullary thyroid cancer occurs without other endocrine tumours it is termed familial medullary thyroid cancer (FMTC).
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